US2842649A - Machine for welding plastic sheet materials - Google Patents
Machine for welding plastic sheet materials Download PDFInfo
- Publication number
- US2842649A US2842649A US63456857A US2842649A US 2842649 A US2842649 A US 2842649A US 63456857 A US63456857 A US 63456857A US 2842649 A US2842649 A US 2842649A
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- US
- United States
- Prior art keywords
- electrode
- machine
- welding
- plastic material
- sheet materials
- Prior art date
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- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
- B29C66/221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
- B29C66/234—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being in the form of tessellations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
- B29C66/8187—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
- B29C66/81871—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/824—Actuating mechanisms
- B29C66/8242—Pneumatic or hydraulic drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
- B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
- B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
- B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
- B29C66/91935—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined lower than said fusion temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/30—Electrical means
- B29C65/305—Electrical means involving the use of cartridge heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
- B29C66/81263—Dielectric properties
Definitions
- This invention concerns a machine for welding plastic sheet materials, more particularly to such a machine for welding continuous sheets of plastic material together along predetermined lines.
- the object of the invention is to provide a machine which enables transverse lines to be rapidly and accurately made on continuous sheets of plastic material of great length, and in particular on structures made up of two superimposed sheets of plastic material enclosing a plastic filling material intended, among other things, for the manufacture of bedspreads.
- the present invention provides a machine which enables seams having the desired appearance to be made.
- a machine for welding continuous sheets of plastic material together along predetermined lines comprises means which cause superimposed sheets of plastic material which are to be Welded to pass between two electrodes for welding by means of high frequency currents, one at least of these electrodes including permanent heating means suitable for maintaining it at a temperature only slightly below the fusion temperature of the plastic material.
- the passage of the highfrequency currents is uniform over the length of the electrode.
- the fusion temperature of the plastic material is reached practically as soon as the electrodes come into contact with the sheet material in order to weld it, due to the action of the additional heat provided by the high-frequency currents.
- the permanent heating means of the/or each electrode may be comprised by several electrical resistances distributed over the whole length of the said electrode each resistance being controlled by a separate thermostat influenced by the temperature pertaining in the vicinity of the resistance which it controls, thereby enabling a perfectly even temperature to be obtained over the whole length of the electrode.
- At least one of the electrodes may be covered with a dielectric material, and the lower electrode can be covered with a sheet of flexible material, possibly coated with a dielectrical material.
- Fig. l is a side view of a machine according to the invention for welding together sheets of plastic material
- Fig. 2 is a corresponding front view
- Fig. 3 illustrates an example of the form of the welding seams which can be produced with this machine.
- thermoplastic packing, stuffing or padding is fed from a roll 3, between upper and lower layers of thermoplastic sheeting fed from rolls 1 and 2 respectively, into the machine.
- the stuffing sandwiched between the thermoplastic material passes between two admission cylinders 4 and 5, over a lower or counter-electrode 6, above which an upper electrode 7 is arranged, and eventually passes over an outgoing roller 8, after which all three layers of material are rolled up on a drum 9.
- the lower or counter-electrode 6 is fixed, while the upper electrode 7, mounted in an electrode holer 18, is movable in a vertical plane under the action of two pistons within compressed air cylinders 11 and 12 carried by a crossbar 10. This arrangement enables an even pressure between the electrode 7 on the counter electrode 6 to be obtained.
- the feed of the superimposed sheets to be welded is effected in a discontinuous manner while the electrode 7 is raised by the action of an advancing arrangement com prising a slide block 13 connected with a piston movable horizontally in a compressed air cylinder 14.
- the slide block 13 is held tight onto the plastic material by a compressed air piston 20.
- the upper electrode 7 is provided with permanent heating means consisting of a plurality (three in the example shown) of electrical resistances 15 distributed over the length of the electrode.
- each resistance 15 is associated an element 16 which is sensitive to temperature and which is placed in the vicinity of the corresponding resistance.
- Each element 16 is connected to an associated thermostat i7 which is clamped in an appropriate position on crossbar 10 and controls the flow of current through each resistance, in order that the temperature of the electrode may be kept perfectly even over the whole of its length.
- the electrode 7 On its lower face, the electrode 7 has a rib or vein in the shape of the welding lines to be made, such as, for example, a double wavy line 19 as shown in Figure 3.
- the electrode holder 13 is electrically connected to the earth return of a generator of high-frequency current 21 by conductors 22, while the lower or counter-electrode 6 is electrically insulated from earth and is connected to the other terminal of generator 21 by conductor 23.
- the lower or counter-electrode 6 may be covered with a layer 24 of flexible material, or one or other of the electrodes may be covered with a dielectric layer which will take the place of the aforesaid sheet of elastic material 24.
- the thermostats are adjusted so that the temperature of the electrode is slightly lower than the fusion temperature of the plasti material to be welded. For example, if the latter melts at 120 C., the thermostats would be adjusted so that the temperature of the electrode was uniformly C.
- plastic material is instantaneously brought to 105 C.
- the counterelectrode may be provided with heating means.
- a machine for welding continuous sheets of plastic material together along predetermined lines in which means are provided to cause superimposed sheets of plastic material which are to be Welded to pass between two electrodes for welding by means of high-frequency currents, one at least of these electrodes including permanent heating means suitable for maintaining it at a temperature only slightly below the fusion temperature of the plastic material, the permanent heating means of the electrode being comprised by several electrical resistances distributed over the whole length of the said electrode, each resistance being controlled by a separate thermostat influenced by the temperature pertaining in the vicinity of the resistance which it controls, thereby enabling a perfectly even temperature to be obtained over the whole length of the electrode.
- a machine as claimed in claim 1 in which at least one of the electrodes is covered with a dielectric material.
- a machine as claimed in claim 1 in which one of the electrodes is covered with a sheet of flexible material.
- a machine as claimed in claim 1 in which one of the electrodes is covered with a sheet of flexible material coated with a dielectric material.
Description
A. JEHIER 2,842,649
MACHINE FOR WELDING PLASTIC SHEET MATERIALS July 8, 1958 Filed Jan. 16, 1957 Y Y INVERTOR ANDRE JEH E'R @amwwn, wmn
' ATTORNEYS MACHINE FQR W ELBTNG PLASTIC SHEET MATERIALS Andr Jehier, Chemille, France Application .lanuary 16, 1957, Serial No. 634,568 4 Claims. or. 219--1tl.47)
This invention concerns a machine for welding plastic sheet materials, more particularly to such a machine for welding continuous sheets of plastic material together along predetermined lines.
The object of the invention is to provide a machine which enables transverse lines to be rapidly and accurately made on continuous sheets of plastic material of great length, and in particular on structures made up of two superimposed sheets of plastic material enclosing a plastic filling material intended, among other things, for the manufacture of bedspreads.
In order to give such bedspreads of plastic material an appearance similar to that of quilted or stitched bedspreads of textile materials, it has already been proposed to simulate the stitched seams by welding the two outer sheets, and even the inside filling material, together along lines which form an ornamental pattern. These lines may be transverse and have an undulating configuration so that the undulations of successive lines are tangential in relation to one another and form a continuous network which extends 'over the whole surface of the article.
The making of such welded lines to produce the desired effect presents dilficulties, as it has not hitherto been possible to effect a uniform softening of the plastic material over the whole length of each welding line, owing to slight variations in thickness of the padding and distortion of the electrode and counter-electrode under the influence of the pressure and heat.
The present invention provides a machine which enables seams having the desired appearance to be made.
According to the present invention, a machine for welding continuous sheets of plastic material together along predetermined lines, comprises means which cause superimposed sheets of plastic material which are to be Welded to pass between two electrodes for welding by means of high frequency currents, one at least of these electrodes including permanent heating means suitable for maintaining it at a temperature only slightly below the fusion temperature of the plastic material.
With such an arrangement, the passage of the highfrequency currents is uniform over the length of the electrode. In addition, the fusion temperature of the plastic material is reached practically as soon as the electrodes come into contact with the sheet material in order to weld it, due to the action of the additional heat provided by the high-frequency currents.
The permanent heating means of the/or each electrode may be comprised by several electrical resistances distributed over the whole length of the said electrode each resistance being controlled by a separate thermostat influenced by the temperature pertaining in the vicinity of the resistance which it controls, thereby enabling a perfectly even temperature to be obtained over the whole length of the electrode.
Furthermore, at least one of the electrodes may be covered with a dielectric material, and the lower electrode can be covered with a sheet of flexible material, possibly coated with a dielectrical material.
The invention will now be further described by way of example with reference to the accompanying diagrammatic drawings, in which:
Fig. l is a side view of a machine according to the invention for welding together sheets of plastic material;
Fig. 2 is a corresponding front view;
Fig. 3 illustrates an example of the form of the welding seams which can be produced with this machine.
Referring to the drawings, thermoplastic packing, stuffing or padding is fed from a roll 3, between upper and lower layers of thermoplastic sheeting fed from rolls 1 and 2 respectively, into the machine. The stuffing sandwiched between the thermoplastic material, passes between two admission cylinders 4 and 5, over a lower or counter-electrode 6, above which an upper electrode 7 is arranged, and eventually passes over an outgoing roller 8, after which all three layers of material are rolled up on a drum 9.
The lower or counter-electrode 6 is fixed, while the upper electrode 7, mounted in an electrode holer 18, is movable in a vertical plane under the action of two pistons within compressed air cylinders 11 and 12 carried by a crossbar 10. This arrangement enables an even pressure between the electrode 7 on the counter electrode 6 to be obtained.
The feed of the superimposed sheets to be welded is effected in a discontinuous manner while the electrode 7 is raised by the action of an advancing arrangement com prising a slide block 13 connected with a piston movable horizontally in a compressed air cylinder 14. The slide block 13 is held tight onto the plastic material by a compressed air piston 20.
The upper electrode 7 is provided with permanent heating means consisting of a plurality (three in the example shown) of electrical resistances 15 distributed over the length of the electrode.
With each resistance 15 is associated an element 16 which is sensitive to temperature and which is placed in the vicinity of the corresponding resistance. Each element 16 is connected to an associated thermostat i7 which is clamped in an appropriate position on crossbar 10 and controls the flow of current through each resistance, in order that the temperature of the electrode may be kept perfectly even over the whole of its length. On its lower face, the electrode 7 has a rib or vein in the shape of the welding lines to be made, such as, for example, a double wavy line 19 as shown in Figure 3. The electrode holder 13 is electrically connected to the earth return of a generator of high-frequency current 21 by conductors 22, while the lower or counter-electrode 6 is electrically insulated from earth and is connected to the other terminal of generator 21 by conductor 23.
Finally, the lower or counter-electrode 6 may be covered with a layer 24 of flexible material, or one or other of the electrodes may be covered with a dielectric layer which will take the place of the aforesaid sheet of elastic material 24.
The operation of the machine which has just been described is very simple.
The thermostats are adjusted so that the temperature of the electrode is slightly lower than the fusion temperature of the plasti material to be welded. For example, if the latter melts at 120 C., the thermostats would be adjusted so that the temperature of the electrode was uniformly C.
When the compressed air is turned on in cylinders 12, by means of a manual or an automatic control mechanism, the electrode 7 descends and presses the sheets of plastic material against the counter-electrode 6. The
plastic material is instantaneously brought to 105 C.
and the high-frequency currents impart to it a quantity of additional heat which at once brings it to the temperature of 120 C., at which it 'begins to melt. Welding is thereby effected along the lines 19. The electrode '7 rises again and compressed air is now directed into the feeding system 13, 14, 20, and the sheets of plastic material move forward, for instance by an amount equal to the distance apart of the lines 19 at the peaks of their undulations. The electrode 7 moves down again and so on to produce a continuous pattern. In this way there is obtained a network of welding lines which has the appearance of that which can be seen in Figure 3, arrow f indicating the direction of movement of the sheets.
It is to be understood that the invention is not restricted to the particular embodiment just described and represented, but can be modified as desired within the scope of the appended claims. For instance, the counterelectrode may be provided with heating means.
What is claimed as new and desired to be secured by Letters Patent is:
1. A machine for welding continuous sheets of plastic material together along predetermined lines, in which means are provided to cause superimposed sheets of plastic material which are to be Welded to pass between two electrodes for welding by means of high-frequency currents, one at least of these electrodes including permanent heating means suitable for maintaining it at a temperature only slightly below the fusion temperature of the plastic material, the permanent heating means of the electrode being comprised by several electrical resistances distributed over the whole length of the said electrode, each resistance being controlled by a separate thermostat influenced by the temperature pertaining in the vicinity of the resistance which it controls, thereby enabling a perfectly even temperature to be obtained over the whole length of the electrode.
2. A machine as claimed in claim 1 in which at least one of the electrodes is covered with a dielectric material.
3. A machine as claimed in claim 1 in which one of the electrodes is covered with a sheet of flexible material.
4. A machine as claimed in claim 1 in which one of the electrodes is covered with a sheet of flexible material coated with a dielectric material.
References Cited in the file of this patent UNITED STATES PATENTS 2,404,191 Quayle et al. July 16, 1946 2,463,054 Quayle et al. Mar. 1, 1949 2,734,982 Gillespie et a1 Feb. 14, 1956 2,747,646 Lippman May 29, 1956 2,757,266 Manwaring July 31, 1956
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63456857 US2842649A (en) | 1957-01-16 | 1957-01-16 | Machine for welding plastic sheet materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63456857 US2842649A (en) | 1957-01-16 | 1957-01-16 | Machine for welding plastic sheet materials |
Publications (1)
Publication Number | Publication Date |
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US2842649A true US2842649A (en) | 1958-07-08 |
Family
ID=24544329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US63456857 Expired - Lifetime US2842649A (en) | 1957-01-16 | 1957-01-16 | Machine for welding plastic sheet materials |
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US (1) | US2842649A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4352709A (en) * | 1978-12-14 | 1982-10-05 | Muneharu Urai | Apparatus for producing seat cushion member |
EP0945247A2 (en) * | 1998-03-25 | 1999-09-29 | Idemitsu Petrochemical Co., Ltd. | Sealing of polyolefin-based resin, and sealed article of the resin |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2404191A (en) * | 1944-04-22 | 1946-07-16 | British Insulated Cables Ltd | Dielectric heating electrode |
US2463054A (en) * | 1944-04-22 | 1949-03-01 | British Insulated Callenders | Apparatus for heating insulating material by subjecting it to a highfrequency field of electric force |
US2734982A (en) * | 1956-02-14 | Dielectric heating electrode | ||
US2747646A (en) * | 1955-10-26 | 1956-05-29 | Lippman Gerald | Process of and apparatus for producing applique ornamentations |
US2757266A (en) * | 1952-02-14 | 1956-07-31 | Miles Mfg Corp | Apparatus for vulcanizing or heating dielectric materials |
-
1957
- 1957-01-16 US US63456857 patent/US2842649A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2734982A (en) * | 1956-02-14 | Dielectric heating electrode | ||
US2404191A (en) * | 1944-04-22 | 1946-07-16 | British Insulated Cables Ltd | Dielectric heating electrode |
US2463054A (en) * | 1944-04-22 | 1949-03-01 | British Insulated Callenders | Apparatus for heating insulating material by subjecting it to a highfrequency field of electric force |
US2757266A (en) * | 1952-02-14 | 1956-07-31 | Miles Mfg Corp | Apparatus for vulcanizing or heating dielectric materials |
US2747646A (en) * | 1955-10-26 | 1956-05-29 | Lippman Gerald | Process of and apparatus for producing applique ornamentations |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4352709A (en) * | 1978-12-14 | 1982-10-05 | Muneharu Urai | Apparatus for producing seat cushion member |
EP0945247A2 (en) * | 1998-03-25 | 1999-09-29 | Idemitsu Petrochemical Co., Ltd. | Sealing of polyolefin-based resin, and sealed article of the resin |
EP0945247A3 (en) * | 1998-03-25 | 2001-04-11 | Idemitsu Petrochemical Co., Ltd. | Sealing of polyolefin-based resin, and sealed article of the resin |
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